Temperature-regulator.



l. HALL.

TEMPERATURE REGULATOR.

APPLICATION FlLED OCT. 19, 1914.

atented Aug. 3, QlE

1;/ 4 SHEETS-SHEET I.

L HAU..v TEWERATURE REGULATOR.

APPucATaoN man 05x19. i914.

IL HU..

'TEMPERATURE REGULATOR.

APPLlcMloN mso ocr. i9. 1914.

Pai-ame@ Aug. 3, m5.

4 SHEETS-SHEEY 3.

lll

TEM'EERATUBE-BEGLTGE.

Specicaton or' Letters atent.

fetenterl fing. 3, @13.5

Application filed Setubal' t9, 1914. Serial No. $81454.

To 1.7i 'urzof/z it may concern:

lle it known that l, lsaiiri HALL. subject of the bling or' Great Britain, residing ll'liiteliouse street, Aston, lirniinggbaniE ni'tlie county if lVarvvic-lr, England, have invented a ne and useful improvement in 'leiiiperature-Regulatorsg and l do hereby declare the following-'to be a full7 clear, and exact description of the saine.

'lliis invention relates toapparatus for regulating and controlling temperatures ot' a similar kind to that set i'ortli in niy ll. :3. Si. application Serial No` 7900i@ .tiled the lGtli bepreinber, 1915, and lias for its object to provide improved apparatus or this purpose, more especially for use with ineil melting furnaces particularly those used type. Apparatus made for renielting in accordance ivitli my said prior invention comprises a casing through which gas passes on its way to a heating burner, and containing a valve controlling the admission ot said valve being operated by a tlierznostat or differential expansion device. l described also in my said prior specilication an adjustable valve seating, and iny present invention comprises improvements on suoli seating and on other parts of the apparatus and the arrangement tliereo".

According; to my present invention l provide apparatus for regulating and bontrolling temperatures of t'ne kind set forth having a valve seating with a thread upon its outer periphery engaging a thread in the seating support in combination with a lrnob bead or like upon tbe exterior of the casing and. secured against axial movement and ine-ans for transmitting rotary movement trois` tlie knob or like. to the valve seating vvliiie permitting to the latter an independent axial movement. This arrangement has the advantage thatl leakage past the seating is mech less lilelyY when it is screw threaded on the outside than when it is merely a sliding fit.Y

.Various other improvements will also be niade clear from tlie description and clairning clauses herein contained. e

Referring to the drawings: Figure l. is an elevation, partly in section, showing a torni of my improved device ivitli the cover removed from the casing. Fig. 2. is a plan t' t same. Fig. 3. is an -ion of the Oi mi@ adjusting head. Fig. 4. shows Lne locking arrangement, and Fig. 5. lshows an alternative form of the invention vvlierein a single lever and an inclined seating are eniployed. Figs. 6, 7 and 8. being views oi de tails. Figs. i) and 1i are elevations showing alternative forms of adjustable pointers. Figs. l0 and l2 being corresponding plans. lj'lig. 13. is a part sectional elevation showing an adjustable combined stop and zero indicator. Figs. la, l5 and 16. being perspective views of details.

ln carrying my invention into practice as illustrated upon tlie accompanying draW- ings l provide a casing 'l wherein projects a rod 2 actuated by a thermostat (ivliicli may be similar to that described in my U, A, application Serial No; TSW/i6 iiled the litli vtlepteinber,19113,) the said rod being ada ited as it rises to raise the sliort end of pivoted lever 3 tlie far end of which operates near the pivot of a ,second lever "l, pivoted at the i'ar end oi' the casing and carrying the gas valve 5, to depress the saine against tbe action or" a spring 6 carried by a screw 'i in the top of the casing. lt will be clear that the temperature at which the valve will close completely7 as also the extent to ,vliicli the valve iviil be open at any given temperature may be adj usted by raisiii-g or lowering the valve seatin'. ccording to this form of my invention the seating support is internally screw-threaded at S to receive the seating 9 ivliicli may be rotated by means of tivo or niore pins l0 adapted to tit inlaoles near its upper ioripliery and carried by a rotatable bead or `vice versa or by other means `for transmitting rotary movement from the knob or like to tbe valve seating While permitting to the latter an independent axial movement. By the use of' such pins l avoid the necessity' for a bridgepiece cir-like across tbe top of the seating as described in my aforesaid prior specification. The rotatable head may lit in a coni cal seating ll formed on the upper part of tbe seating support and may also have a horizontal annular portion l2 adapted to lie upon the upper surface of the sa ine. pin

13 or projecting point upon either tbe seating support or tbe bead may revolve within a slot 14E or depression formed in the other,

a stop being disposed at one point in tbev slot so that one complete revolution is permitted. to the head without disengagement gagement is prevented by means of a retainof the same from the seating supportv in order to lift the pin or projecting point over the stop in the slot. Normally such disening 'ring 15 which is screwed dovvn against the upper part of the seating support which projects beyond the casing.

The pitch of the thread on the seating is in a preferred form of the invention so temperatures desired for the particular material or process in question. For instance for re-xnelting type metal the range may conveniently extend over 1750. I may also provide a locking devicecomprising a han dle 18 on a spindle 19 by means of Which a pair of'suitably curved members 20, 2.1 may be drawntogether to lock 'against the face of the conical portion of the head.

According to a modification each revolution of the head is equivalent to a sub-multiple of the' total range of temperature desired, say to-10O or 20, and the stop or like may be raised to pass the fixed stop in passing from one such range of 1()o to 20O to another. Clearly such an arrangement makes it particularly important that the openingof the valve shall vary as nearly as possible in direct proportion to the ditl'erence of temperature throughout -the full range, although this is in any case important in order to keep the graduations showing the temperature equally spaced. New in cases Where the contact between the thermostat and'lever is by means of a square end or the like it is clear that as `the differential expansion takes eifecthe angle of the pivoted lever is changing and the eilectivepoint of engagement also changes, folr` the engagement Willbe between the one edge of the inner differential expansion member andthe lever after the lever has moved from its position at right angles to the differential expansion member, the effect of this being to change the leverage by reducing the distance between'the point of effective engagement and the pivot point, with the result that the movement of the valve or indicator will not ,application Serial No. TS100-i6 tiled the 16th, i

be directly proportional to the movement of the differential expansion controlling device. In order to overcome thisdefect the rod 9.' has itsA extremity recessed to receive a small steel ball Which abuts either directly against the lever or against arecess formed on the underside of a yoke piece 23, pivotly secured to the said lever, the contact being between the highest point of the ball and the underside of the lever or yoke piece, no matter what thev angle of inclination of the lever is, or I may use an equivalent arrangement, This arrangement. is ap,

to exclude equivalents i'fio'ni lthe scope of my invention. For instance in some cases I may employ a single longer lever in place of the two described, and various forms of head and locking device maybe used.

As shown at Fig. 5 a single lever 2li is pivoted at and has one end resting upon the rod 2 throughthe medium of the steel ball 22. The farther end of the lever is attached yto and carries a valve 2G which is adapted to be moved from or toward its seating 27 thereby.' In order to obtain the greatest possible movement of the Valve I prefer to arrange this seating in a corner of the chamber opposite to that in which the differential device is disposed; the lever or rod may he parallel lto the bottom* of the chamber until after the pivotal. point when it must be bent so fis/to bring the valve to the correct position with regard to the seating which is inclined so that the motion of the valve about the pivot withdraws the same in a direction substantially at right angles to the seating. .i spring 28 is disposed to tend to hold the valve upon its seat as in mv aforesaid prior speciication.A

In order to uctuate an indicating deviceI such as is shown in my li. S. L application Serial No. 79,0046, tiled the 16th, September 1913, in case such is to he employed I may provide either a separate brunch upon the lever or the indicating device might he actuated from an internudiate point or from au extension upon the saine. Some 'method .ot gradi ating the head or the top of the chamber to show the temperature to which 'hewlevico is set may be provided such as a fixed pointer 29 or mark upon the casing and a graduated scale marked around the upper surface of the head, or a pointer might be carried by the head to reed upon al fixed scale.

I have found that 1n using a theruiostatic device as described herein or 1n my U. S. A.

September 1913, in a molten type metal bath it is ditlicult to plug the bottom of the de- A pending tube 29A in such a way that none of the metal will get past the plug. A solid ended 'tube is expensive and diilcult to drill out if it is of any considerable length and accordingly I prefer to use a cyliiulrical plug of steel 30A which is driven into the lower end of the tube and electrically weht ed, and a cap 31A` or like is thou placed over thefoutside of the bottom oiA the tube and also" electrically welded. l have also lijn Liceo/ie found that for the inner member of the thermostat electrilied graphite forms a suitable material.

It Will be clear that either in the present ,upon which the dili'erential expansionis et- Jfective is thus the length ot' the carbon stick or like; and by altering the length ot' the same and correspondinglyv altering the length of the intermediate rod l am enabled to obtain an effective adjustment of the nature of the regulation etl'ected by the device without necessarily altering the length of the outer tube.

In order to obtain a correct adjustment of the pointer 29 relatively to the scale we may mount it-upon a sheet metal base 30 provided with a slot or slots 31, a screw 32 being adapted to secure lit to the casing. Moreover we may make the stop or pin 13 adjustable together with a zero-mark or pointer 33 whichv may be so adjusted as to give a required temperature as that at Which a range,.ottemperatures is to be entered,`

and thus the same instrument may be adapted to enter upon its range at various temperatures, the markings 3l not being definitely ftxed for any particular temperature, but each; reading to the lett of the zeromark'denoting (say) 5G above the temperature at which the range is set to be entered. It will be seen that the pin 13 and zeromark 33 are both carried upon the base plate 35 and are adjustable Within the'lim-Y its of the slot 36. Metal tongues 37 are provided, so that the retaining ringl bears against these tongues; as Well as the seromark 38 and keeps the head evenly upon its seat. This device may be employed apart from or in conjunction with lrhe adjustable pointer 29.

What l claim then is 1. In apparatus for regulating and controlling temperatures the combination ot a casing through which gas is adapted to pass; a valve; a thermostat adapted to operate said valve; a valve seating having a screw thread upon its outer periphery; a seatirg support wherein the valve seating is screwed; a head upon the exterior of the l casing secured against axial movement; and

means for transmitting rotary movement from the said head to the said valve seating while permitting to the latter an independent axial movement.

Q. in apparatus for regulating and controlling temperatures the combination of a casing through which gas is adapted to pass; a valve; a thermostat adapted to operate said valve; a valve seating; a head upon the exterior of the casing adapted to adjust said valve seating; and means for limiting the rotation of the head to a single revolution and to correspond to a predetermined range of temperature 3, In apparatus'tor regulating and controlling teniperatures the combination of a casing through which gas is adapted to pass; a valve; a thermostat adaptedrtc operate said valve; a valve seating having a screvvthread upon its outer periphery; .a

vseating support wherein the valve seating is screwed; a head upon the exterior of the casing secured against axial movement; and means for transmitting rotary movement from the said head to the said valve seating while permitting to the latter an independent aXial movement; and the various parts being proportioned relatively to the -pitch of the thread upon the valve seating that a single revolution of the head corresponds to a predetermined range oi temperature. Y L

fl. ln apparatus for regulating and controlling temperatures the combination of a casing through which gas is adapted to pass; a. valve; multiplying mechanism carrying saidvalve; a thermostat depending from said casing and comprisingan outer tube'and an inner rod; a steel ball intermediate said inner rod and said multiplying mechanism; a valve seating having a screvvthread upon its outer periphery; a seating support wherein the valve seating screwed; a head upon the exterior of the casing secured against axial movement; and means for transmitting rotary movement from the said head to thesaid valve seatn ing while permitting to the latter an indef pendent axial movement. f

5. ln apparatus for regulating and controlling temperatures the combination or" a casing through which gas is adapted to pass; a valve; a thermostat adapted to operate said valve; a valve seating having a screivthread upon its outer periphery; a seating support. `wherein the valve mating is screwed; a head upon the exterior of the casing secured against axial moyeinent; means for transmitting rotary movement from the said head to the said valve seating vvhile permitting to the latter independent axial movement; a stop for normally limiting the rotation of the head to a single revolution correspondingto a denite range of temperature.

6. ln apparatus for regulating and cona thermostat adapted 't i opcarrying said valve; a thermostat adapted and a plurality of pins slidably engaging holes near the upper periphery of said seating and carried by said head.

f 7. In apparatus for regulating and controlling temperatures the combination of a casing through which gas is adapted to pass; a valve; a lever pivoted within said casing, having its longer end bent upwardly and trolling temperatures the combination of a casing through which gas is adapted to pass; a valve; a thermostat adapted to operate said valve; a valve seating having a screw thread upon its outer periphery; a seating support wherein the valve seating is Y screwed; a head upon the exterior ot the "casing secured against axial movement7 means for transmitting rotary movement from the said head to the said valve seating while permitting to the latter an independent aXial movement; a pointer upon the casing adapted to. register against said head; a slotted base carrying said pointer; and a screw adapted to secure said base to the casing.

9. In a Jaratus or revulatino' and con.

trolling temperatures the combination 4of a casing through which gas is adapted to pass ;4

a valve; a differential expansion device adapted to operate said valve; a valve seating; a head upon the exterior of the casing adapted by its rotation to raise or lower said seating; a pointer upori the casing adapted to register against said head; an adjustable plate adapted to be xed to said meente `adapted to operate 'said valve; a valve seat- Aing; a head upon the exterior of the casing adapted by its rotation to raise or lower said seating;` a pointer upon the casing adapted to register against said head; a slotted base carrying said pointer; a screw adapted to secure said base to`the casing; an adjustable plate adapted to be fixed to et 'l said head; a ,zero-mark carried by said plate; and a pin carriedby said plate opposite to said pzero-narl.

ll. ln apparatus for regulating and controlling temperatures the combination of ,a casing through which gas is adapted to pass; a valve; a thermostat adapted to'operate said valve; a valve seating having a screw thread upon its outer periphery; a seating support wherein the valve seating is screwed; a head upon the exterior of the easing secured against axial movement; means for transmitting rotary movement from the said head to the said valve seating while permitting to the latter an independent axial move'- ment; a pointer upon the casing adapted to register against said head; a slotted base carrying said pointer; a screw adapted to secure said base to the casing; an adjustable plate adapted to be iXed to said head; a zero-mark carried by said plate; and a pin vcarried by said plate opposite to said zero-mark.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses'.

Ireame HALL. e l

Witnesses HAROLD H. Fomzns'rnn, ARNOLD S. ILLs'roN. 

